Apparatus for driving spindle for effecting false twisting of yarns

ABSTRACT

An apparatus for driving a spindle for effecting false twisting of yarns in which a drive roller frictionally contacts a spinner to rotate it with high speed. Said spinner loosely fits in the grooves formed in the ends of a fixed magnet. The portions of the spinner loosely fit in grooves of a fixed magnet having a polarity the same as the polarity of corresponding grooves of the fixed magnet respectively whereby due to repulsion produced between the polarities, said spinner is urged to abut said drive roller and also its rocking motion is avoided. In front of respective poles of said fixed magnet, a metal plate of high permeability is provided with an airgap therebetween to increase magnetic flux density of said polarity portions.

United States Patent [72] Inventors Nobuhisa Kodaira 7-10, Kami-Renjyaku Z-chome, Mitaka; Norio Motegi, 2-8, Sakura l-chome, Norio, Tokyo, Japan [21] Appl. No. 841,438 [22] Filed July 14, 1969 451 Patented May 18, 1971 32] Priority Aug. 21, 1968 [33] Japan [31 43/59192 [54] APPARATUS FOR DRIVING SPINDLE FOR EFFECTING FALSE TWIS'IING OF YARNS 5 Claims, 13 Drawing Figs. [52] US. Cl 57/77.45, 74/210, 57/103 [51] Int. Cl D01h 7/92 [50] Field oi Search 57/34, 77.45, 103; 74/203, 210

[56] References Cited UNITED STATES PATENTS 2,855,750 10/1958 Schrenk et a1. 57/77.45X

3,304,706 2/1967 Mattingly 57/77.4s 3,473,313 10/1969 Crouzet 57/77.45 FOREIGN PATENTS 908,113 10/1962 Great Britain 57/77.45

Primary Examiner-Donald E. Watkins Attorney-Cullen, Sloman & Cantor ABSTRACT: An apparatus for driving a spindle for effecting false twistingof yarns in which a drive roller frictionally contzicts a spinner to rotate it with high speed. Said spinner 1oose ly fits in the grooves formed in the ends of a fixed magnet.

The portions of the spinner loosely fit in grooves of a fixed magnet having a polarity the same as the polarity of corresponding grooves of the fixed magnet respectively whereby due to repulsion produced between the polarities, said spinner is urged to abut said drive roller and also its rocking motion is avoided. In front of respective poles of said fixed magnet, a metal plate of high permeability is provided with an airgap therebetween to increase magnetic flux density of said polarity portions.

PATENIED am a m I 3,578,751 Sam 1 nr 3 lA/VIN rap 5 M... ,M w M am y p k m mm A we APPARATUS FOR DRIVING SPINDLE FOR EFFECTING FALSE TWISTING OF YARNS This invention relates to an apparatus for driving a spindle for effecting false twist of yarns.

One example of the conventional apparatus of this kind is such that it comprises two horseshoe-shaped magnets placed side by side and straddles the top and bottom faces of a drive roller that is driven at high speed, in front of its ends having the same polarity, a forwardly edged magnet piece is abutted thereto, the edged ends of the upper and lower abutting pieces are located slightly inside of the outer ring provided on said drive roller whereby the edges of said upper and lower magnets attract a spinner of highly permeable metal so that is presses against the drive roller.

In such apparatus, since it has no physically frictional portion to support the spinner rotating with high speed, this will be convenient for effecting high-speed rotation of the spinner.

However since it supports the spinner only with attraction on the side of drive roller, it has very small force to return the rocking spinner to its original position.

Therefore the spinner tends to rock during its rotation resulting from load fluctuation.

One object of the present invention is to provide such driving apparatus that the spinner is urged to effect rolling contact with a drive roller by magnet force, yet said spinner is kept from rocking motion.

Another object of the present invention is to possibly minimize a friction loss between the spinner and its supporting member.

Still another object of the present invention is to increase a contact pressure between the spinner and drive roller that drives the former.

The feature of the present invention is such that the spinner itself is made of a strong magnetic material or a high permeability metal pipe with cylindrical magnets on its opposite ends and the midportion of the spinner is rollingly engaged with the circumferential face of the drive roller, the opposite ends of the spinner loosely fit in the grooves provided at the opposite poles of a fixed magnet and in the area of such loose fit, the arrangement of the spinner relative to the fixed magnet is such that the same polarities of the spinner and the fixed magnet face each other and by a repulsion produced therebetween the spinner is urged towards the drive roller, yet the rocking motion of the spinner is eliminated.

Another feature of the present invention is the provision of a highly permeable plate confronting to the poles of the fixed magnet with a slight gap therebetween to intensify a magnetic flux density in that area.

Other features and advantages of the present invention will become more apparent by the following description with reference to the accompanying drawings in which:

FIG. 1 is a longitudinal section view of the apparatus of the present invention.

FIG. 2 is a perspective view of a fixed magnet forming a part of the apparatus.

FIG. 2A is a perspective view of a modified form of the fixed magnet in FIG. 1.

FIG. 3 is a plan view of the fixed magnet showing the mounting equipments.

FIG. 4 is its front view.

FIG. 5 is a longitudinal section view of a spinner.

FIG. 6 is a longitudinal section view of another type of spinner.

FIG. 7 is a longitudinal section view of the apparatus of another embodiment.

FIG. 8 is a plan view of a fixed magnet of the other embodiment.

FIG. 9 is section view taken on the line IX-IX in FIG. 8.

FIG. 10 is a longitudinal cross section view of the apparatus provided with a confronting plate.

FIG. 11 is a plan view of the above.

FIG. 12 is a perspective view of the confronting plate.

In FIG. 1, l is a drive roller securely mounted on the top end of a spindle 3. 2 and 2 are outer rings of urethane elastomers provided on the periphery of the drive roller 1. 4 is a bearing for the spindle 3. 5 is a bushing surrounding the lower portion of spindle 3 and is rotatable in engagement with a high-speed belt (not shown). 6 is a standard supporting spindle 3. 7 is a fixed magnet having poles in the position one above and the other below the drive roller 1, each magnet end is provided with a groove 11 and 11' respectively as shown in FIG. 2. Such groove may be wide open at its outside as shown in FIG. 2A. Preferably the inside of respective groove is covered with a thin film layer of nonmagnetic metal or nonmetal material so that the spinner 8 may not directly contact the pole end of the fixed magnet. The magnet is made of such alloy of aluminum, nickel, cobalt or'Almico 5 having a sufficient coercive force and residual flux density. 8 is a spinner having more coercive force such as Almico 8 or barium ferrite, or of alloy of copper, iron and cobalt with samarium or cerium.

While the fixed magnet can have a substantially large configuration in its cross-sectional area as well as its length, the spinner should be made relatively smaller so that the latter needs to have more coercive force. Also the spinner as shown in FIG. 6 comprises two cylindrical magnet portions 9 and 9 which are inserted with a loose fit in respective grooves 11 and 11' of the fixed magnet and the rest is made of high permeable metal. Said magnet portions of the spinner should be placed as to the magnetizing direction, one pole on the outer periphery and the other pole on the innner periphery of the spinner as referred to with N-S in FIGS. 5 and 6. The cylindrical magnets too may be made of barium ferrite or alloy of copper, iron, cobalt with samarium or cerium. 10 is a projection to hold the spinner against the movement in upward and downward direction.

12 is a bushing for the spindle bearing. 13 is a yarn guide. In FIGS. 3 and 4, 14 is a supporting arm for the fixed magnet and 15 its abutting member. 16 is a holding screw. 17 is a pin to be a fulcrum of the arm l4. 18 is a fixed portion of said pin. 19 is a stopper to set the arm 14 to the desired position. 20 is a setting screw.

FIG. 7 is a cross section view of the apparatus of another embodiment wherein the spindle is driven directly by a motor without the medium of high-speed belt. Instead of the bushing at the lower end of spindle as in FIG. 1, a magnet bushing hav-- ing a coercive force of He -200 oersteds is provided and its outer stator having two-phase or threephase windings to form a high-speed hysteresis synchronous motor. A cage motor may be utilized for the high-speed induction motor. However, it is not preferably to provide it since there is some difficulty in balancing of the rotor and more particularly it is impossible to set the revolution at a constant ratio.

In'FIG. 7, 21 is a bushing for a rotor magnet 22. 23 is a stator core and 24 stator winding. 25 is a cover of the lower end of motor. 26 is a bolt for securing the cover and stator to the supporting standard 6.

The fixed magnet shall be made of alloy such as barium ferrite, copper, iron, cobalt with samarium or cerium to have more coercive force. As seen in FIGS. 8 and 9, upper and lower magnets are provided, each one end is fixed to a member of nonmagnetic material as copper, brass and aluminum thus forming a side-down U-shape. Each of the other magnet ends is provided with a vertical groove in which a spinner magnet loosely fits.

As shown with N-S in the drawings, each of the upper and lower portions are magnetized in a vertical direction. In this instance, the spinner is also made of the same material as that of the fixed magnet and magnetized in a vertical direction.

Since the fixed magnet can take a sufficient area in its cross sectional area as well as its length, it provides a strong magnetic force thus its flux density is high enough while the spinner magnet should be small for high-speed rotation so that it is very difficult to have a great flux density however strong a magnet material is used. Since the repulsion between the two magnets is proportionate to the square of magnetic flux density of respective magnets in the gap therebetween, in order to increase the repulsion, the magnetic flux density should be larger. In the present invention, there is provided a confronting plate of high permeability metal facing with a small gap to the pole of the fixed magnet so as to increase the magnet flux density whereby the spinner is forced to move frictionally engaged to the drive roller. In FIGS. and 11, numeral 29 represents a confronting plate. 27 is a supporting bush for the spindle integrally mounted to the spindle standard and 28 is its axis In either of the above embodiments, the spinner is largely supported by magnet lines of flux in the space and there is less friction than with a bearing. For accelerating rotation, there is only a rolling friction in the portion contacting the outer ring of the drive roller so that friction is very small (less 2gr cm), rotation of the spinner even with 400,000 r.p.m. requires less than 6 watts power. This spinner is durable and can be rotated at more than 600,000 r.p.m.

We claim:

1. An apparatus for driving a spindle for effecting false twist of yarns comprising a drive roller affixed to a spindle, a fixed magnet having a groove in respective poles, a cylindrical spinner having a pole on its inner periphery and the other pole on the outer periphery characterized in that the midportion of said spinner is rolled by rolling contact with the outer peripheral face of said drive roller, also the opposite ends of said spinner are inserted with a loose fit in the groove of respective poles of said fixed magnet, the respective portions of said spinner loosely fit in said groove of the fixed magnet and are arranged to have the same polarity with that in the corresponding groove of said fixed magnet.

2. An apparatus for driving spindle for effecting false twist of yarns as claimed in claim 1, characterized in that said spinner provides at opposite ends thereof cylindrical magnets thereon, one pole of which is on the outer face of the spinner and the other pole is on the inner face of the spinner, said poles having contrary polarity to each other.

3. An apparatus for driving spindle for effecting false twist of yarns as claimed in claim 1, characterized in that each groove on the opposite ends of said fixed magnet has a thin film of nonmagnetic metal or nonmetal material covering on the groove respectively.

4. An apparatus for driving spindle for effecting false twist of yarns as claimed in claim 1, characterized in that a confronting plate of high permeability metal is provided to face the poles of said fixed magnet with a small gap therebetween.

S. An apparatus for driving a spindle for effecting false twist of yarns comprising a drive roller affixed to a spindle, a cylindrical spinner 8 mounting spaced cylindrical magnets 9 having poles adjacent its upper and lower ends, and fixed magnets 70, 7b having each pole at their upper and lower face respectively and having a groove at their sides, said spinner being arranged so that its midportion is in rolling contact with said drive roller, said cylindrical magnets 9 being inserted with a loose fit in the groove of the fixed magnets so that the respective pole of said cylindrical magnets is adjacent the pole of the corresponding fixed magnet 7a, 7b and the polarity of such poles is identical to each other respectively. 

2. An apparatus for driving spindle for effecting false twist of yarns as claimed in claim 1, characterized in that said spinner provides at opposite ends thereof cylindrical magnets thereon, one pole of which is on the outer face of the spinner and the other pole is on the inner face of the spinner, said poles having contrary polarity to each other.
 3. An apparatus for driving spindle for effecting false twist of yarns as claimed in claim 1, characterized in that each groove on the opposite ends of said fixed magnet has a thin film of nonmagnetic metal or nonmetal material covering on the groove respectively.
 4. An apparatus for driving spindle for effecting false twist of yarns as claimed in claim 1, characterized in that a confronting plate of high permeability metal is provided to face the poles of said fixed magnet with a small gap therebetween.
 5. An apparatus for driving a spindle for effecting false twist of yarns comprising a drive roller affixed to a spindle, a cylindrical spinner 8 mounting spaced cylindrical magnets 9 having poles adjacent its upper and lower ends, and fixed magnets 7a, 7b having each pole at their upper and lower face respectively and having a groove at their sides, said spinner being arranged so that its midportion is in rolling contact with said drive roller, said cylindrical magnets 9 being inserted with a loose fit in the groove of the fixed magnets so that the respective pole of said cylindrical magnets is adjacent the pole of the corresponding fixed magnet 7a, 7b and the polarity of such poles is identical to each other respectively. 